The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2022
Filed:
Oct. 13, 2017
Nbc Meshtec Inc., Tokyo, JP;
NBC MESHTEC INC., Tokyo, JP;
Abstract
A mask having an inner surface facing a wearer and an outer surface located opposite to the inner surface has first to fourth filters. The first filter is disposed on the outer surface of the mask and has air permeability and a water absorption capacity of 100% or more and less than 1000%. The second filter is layered on the first filter on the side of the inner surface of the mask and has air permeability and a water absorption capacity of less than 30%. The third filter is layered on the second filter on the side of the inner surface of the mask and is formed of an electret filter having air permeability and a water absorption capacity of less than 50%. The fourth filter is disposed on the inner surface of the mask and has air permeability.